A telling comment at Parapundit.
"We can't do what we do without [Hispanic laborers]," says Pete Seghesio, CEO of Seghesio Family Vineyards in Sonoma County. "California cannot make 90-point wines without the hand care of these individuals. We're not Australia, where many of the [farming operations] are done by machines. It's impossible to make the kind of quality wine we're making in California today without this labor force of hands."
In his classic works about the history of technology in pre-modern China, Joseph Needham maintained that one reason for the Industrial Revolution not happening in Asia was the abundance of slave labor, which made the adoption of labor-saving technologies difficult to justify.
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